[Bob Mulry]

I know that you are not going to believe this.......But I made a mistake ONCE

I had the pickup polarity reversed and the timing mark bounced around like crazy. This was on an MSD-7A and crank trigger....

With the shielded leads they did a color swap and that caused my problem....

I reversed the leads and the problem went away....

It seems like a pretty easy test to do and it might solve your problem..

Bob